Aaron Katersky reports after masked federal agents clashed with protesters during immigration raids at California farms, with authorities throwing smoke canisters toward the crowd; Kayna Whitworth has details on the remarkable escape of all 31 workers after a massive tunnel under construction partially collapsed in Los Angeles County; Trevor Ault has the latest on the desperate search following the Texas flood disaster with 172 people still missing and the death toll rising to 120; Will Reeve,